Alteration of 1,2-diacylglycerol content in ischemic and reperfused heart.
The myocardial 1,2-diacylglycerol (DG) and phospholipid levels during ischemia and reperfusion were studied in open-chest dogs by means of sequential epicardial minibiopsies, followed by quantification based on mass measurement technique. 1,2-DG level increased as early as 5 min after coronary ligation but decreased at 30 min. Also as early as 2 min after postischemic (35 min) reperfusion, 1,2-DG level increased transiently compared to pre-reperfusion level. Prazosin inhibited these changes significantly. A significant change in the incidence of reperfusion-induced ventricular tachycardia (VT) was not obtained in the prazosin-treated group. However, the 1,2-DG level 2 min after reperfusion was significantly higher in the ischemic myocardium developed reperfusion-induced VT than in the undeveloped one. Phospholipid levels remained unchanged during ischemia and reperfusion. These results suggest that alpha 1-adrenergic stimulation occurs early in ischemia and reperfusion and leads to 1,2-DG accumulation, which may be involved in the pathogenesis of ischemic and reperfusion injury.
Kawai
T
T
Second Department of Internal Medicine, Nagoya University School of Medicine, Japan.
Okumura
K
K
Hashimoto
H
H
Ito
T
T
Satake
T
T
D000818:Animals; D001145:Arrhythmias, Cardiac / Q000378:metabolism; D003327:Coronary Disease / Q000378:metabolism*; D004075:Diglycerides / Q000378:metabolism*; D004285:Dogs; D007700:Kinetics; D008297:Male; D015425:Myocardial Reperfusion; D009206:Myocardium / Q000378:metabolism*; D010743:Phospholipids / Q000378:metabolism; D011224:Prazosin / Q000494:pharmacology
C011439:1,2-diacylglycerol; D004075:Diglycerides; D010743:Phospholipids; D011224:Prazosin